起升系统设备主要由()、井架、游动系统、绞车刹车、井口工具等组成。
参考答案:绞车
同义句变化。
1. Thank you very much.
Thanks _____ _____.
2. I often walk to school.
I often go to school _____ _____.
3. It is not far from my home to school.
The school is _____ my _____.
4. She has a shopping list in her hand.
_____ _____ a shopping list in her hand.
5. Why don't you leave home a little earlier?
Why _____ _____ home a little earlier?
变压器绕组变形试验,频率响应曲线的范围是1kHz-1000kHz,频响曲线相互比较主要应在()频率范围内分析频率偏移。
A.1kHz-100kHz
B.1kHz-600kHz
C.100kHz-600kHz
D.600kHz-1000kHz